Audio interface



FIG. 1 is a perspective view of an audio interface showing my new design;

FIG. 2 is a top plan view thereof;

FIG. 3 is a front view thereof;

FIG. 4 is a bottom view thereof;

FIG. 5 is a rear view thereof;

FIG. 6 is a left side view thereof; and,

FIG. 7 is a right side view thereof.

The broken line showing of the audio interface is included for the purpose of illustrating environmental structure and forms no part of the claimed design. 

The ornamental design for an audio interface, as shown and described. 